Help Identify GB Plate Number, Cancellation

I found this cover in a stack that I hadn't looked in for quite awhile. The stamp is Scott 33, and had a notation that it was Plate 209. However, I can only identify "60", which is not possible. I'm also interested in the cancellation (B, Raphoe, October 21, 1873).

Here is the front:


You should be able to see a faint reversed cancellation on the left side. This was probably transferred from a letter stacked on top, as you can see it easily matches the location and type of the backstamp from this cover:


Here is a closeup of the stamp itself. It appears to have an interesting cancellation of 818?



When I rotate the image and look at the plate number just above the queen's nose, I can only see "60". Below is that closeup scan, plus an image from Retroreveal which doesn't help me any:



When I rotate to the other side of the stamp, it also appears to be "60". Retroreveal still couldn't help me out:



So, please help me to confirm the plate number, which is probably 160 as 60 doesn't exist. Also, any comments about the cancellation? Thanks.

Plate 160

21 OCT 1873 makes plate numbers upward from 170 impossible as they were put to press at a later time.

Plate 160 was put to press 17 AUG 1872.

The '60' is quite visible and as you state '60' itself does not exist for this design with the plate numbers added,

RAPHOE Missing in the database
Copy of an image requested
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wiki
Raphoe is a historical town in County Donegal, Ireland. It is the main town in the fertile district of East Donegal known as the Laggan, as well as giving its name to the Barony of Raphoe, which was later divided into the baronies of Raphoe North and Raphoe South, as well as to the Roman Catholic Diocese of Raphoe and the Church of Ireland (Anglican) Diocese of Derry and Raphoe.

Raphoe, historically Raffoe, comes from the Irish Ráth Bhoth, which is made up of the words ráth (fort) and both (hut). This likely refers to clay and wattle huts surrounded with a strong fortified mound. It is believed these huts were built by monks in the early Christian period

The town of Raphoe is in Co. Danegal (Ireland). The barred numeral does fit the Irish Diamond barred cancel. 818 is unlikely. 318 would be possible, but that appears to be for Maghera in Co. Derry.

Raphoe itself had numeral 383.

G. Brumell's British Post Office Numbers 1844-1906 lists the Irish number 318 as being used by Maghera from 1844-74. 818 is beyond the number range used.

The distance between Maghera and Raphoe is 44.5 miles.

So, it appears to be Maghera through Raphoe to Manchester.

Agree with Bob,
I did look at a possible damaged "9"
319
Which was MAGHERAFELT DERRY

Diamond barred designs appear numerous, this one a 3-5-5-3



Any chance of a scan image?

Irish numerals went to 564

List of Irish office numbers

https://www.gbps.org.uk/information...0Ratings.pdf

Thank you

Thanks to everyone for their hard work. It's amazing the information you can get from this forum ... especially if you disappear for a few hours and the comments come rolling in. I did send the cancellation through Retroreveal one more time, and it appears that 318 is correct:


Even though this is a lower valued item, the information from this Forum will be used in my inventory system. Thanks to all.

Adjusting my opinion on the diamond
Being a possible 4-5-5-4 strike.

Double hammer strikes on your cover
(John Hendy)
The "B" on your postmark, is simply to identify the hammer for internal auditing.